*::after, *::before {
  box-sizing: border-box;
}

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  background: #350048;
}

.container {
  width: 600px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
}

.container .btn {
  position: relative;
  width: 155px;
  height: 50px;
  margin: 20px;
}

.container .btn a{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(255,255,255,.05);
  box-shadow: 0 15px 35p rgba(0,0,0,.2);
  border-top: 1px solid rgba(255,255,255,.1);
  border-bottom: 1px solid rgba(255,255,255,.1);
  border-radius: 30px;
  color: #FFF;
  font-weight: 400;
  letter-spacing: 4px;
  text-decoration: none;
  overflow: hidden;
  transition: .5s;
  backdrop-filter: blur(15px);
  z-index: 2;
}

.container .btn:hover a{
  letter-spacing: 10px;
}

.container .btn a::before{
  content: '';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(to left, rgba(255,255,255,.15), transparent);
  transform: skewX(45deg) translateX(0);
  transition: .5s;
}

.container .btn:hover a::before{
  transform: skewX(45deg) translateX(200%);
}

.container .btn::before {
  content: '';
  display: block;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -5px;
  width: 30px;
  height: 10px;
  background: #f00;
  border-radius: 10px;
  transition: .5s;
  transition-delay: 0s;
}

.container .btn:hover::before {
  bottom: 0;
  height: 50%;
  width: 80%;
  border-radius: 30px;
  transition-delay: .5s;
}

.container .btn::after {
  content: '';
  display: block;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: -5px;
  width: 30px;
  height: 10px;
  background: #f00;
  border-radius: 10px;
  transition: .5s;
  transition-delay: 0s;
}

.container .btn:hover::after {
  top: 0;
  height: 50%;
  width: 80%;
  border-radius: 30px;
  transition-delay: .5s;
}

.container .btn:nth-child(1)::before,
.container .btn:nth-child(1)::after {
  background: #ff1f71;
  box-shadow: 0 0 5px #ff1f71, 0 0 15px #ff1f71, 0 0 30px #ff1f71, 0 0 60px #ff1f71;
}

.container .btn:nth-child(2)::before,
.container .btn:nth-child(2)::after {
  background: #2bd2ff;
  box-shadow: 0 0 5px #2bd2ff, 0 0 15px #2bd2ff, 0 0 30px #2bd2ff, 0 0 60px #2bd2ff;
}

.container .btn:nth-child(3)::before,
.container .btn:nth-child(3)::after {
  background: #1eff45;
  box-shadow: 0 0 5px #1eff45, 0 0 15px #1eff45, 0 0 30px #1eff45, 0 0 60px #1eff45;
}